ET INFO Explorer Shell CLSID COM Object Call Method Inbound via TCP

Query · suricata

flow:established,to_client;
content:"explorer.exe|20|"; nocase;
content:"shell|3a 3a 3a 7b|"; within:20; fast_pattern;
pcre:"/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]\x7d/Ri";
target:dest_ip;
Raw source ET INFO Explorer Shell CLSID COM Object Call Method Inbound via TCP · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET INFO Explorer Shell CLSID COM Object Call Method Inbound via TCP";
    flow:established,to_client;
    content:"explorer.exe|20|"; nocase;
    content:"shell|3a 3a 3a 7b|"; within:20; fast_pattern;
    pcre:"/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]\x7d/Ri";
    classtype:misc-activity;
    sid:2027201; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2019_04_15, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_05_25;
    target:dest_ip;
)

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